THE EURYPTERIDA OF NEW YORK 359 
P. buffaloensis Clarke. Zittel-Eastman, Textbook of Pal. v.1, pt 2, tgoo, 
p. 678, fig. 1425 
P. buffaloensis Seeman. Beitr. z. Pal. u. Geol. Oesterr.-Ung. u. d. Orients. 
1906. 19:51 @ Seq. 
The quarrying operations in the cement rocks near Buffalo have 
brought to light numerous fragments of large Pterygoti which, as they 
were found, were described as new species by the curators of the But- 
falo Museum. Seven species were thus named. Later years have furnished 
more complete specimens and these show that only two species of 
Pterygotus can at best be recognized at this locality... One of these is 
identical with Hall’s P. cobbi; the other a form of gigantic propor- 
tions, is here discussed. : 
The history of this species, briefly stated, is as follows: 
In 1875 Grote and Pitt described and figured the masticatory edge 
of a gigantic coxa [pl. 79, fig. 1], which they termed P. cummings, 
stating that ““P. macrocephalus (sic) and P. osborni are 
evidently very much smaller species, measuring scarcely as many inches as 
P. cummingsi does feet, and are undoubtedly distinct.” 
Then Pohlman in 1881 described and figured the swimming leg 
here reproduced on plate 78, figure 2, as representing his new species 
P. buffaloensis, referring also a fixed ramus of a large chela to the 
same species. The latter is identical in form with the same part of a much 
ce 
smaller individual figured by Hall on his plate 80A, figure 6 as “ undeter- 
mined crustacean.’”’ The following year Pohlman published a further paper 
on fossils from the waterlime group of Buffalo in which a telson of a young 
individual slightly more slender than the average telson is made the 
type of a species, P. acuticaudatus, and a detached ultimate 
postabdominal segment that was mistaken for a telson is used as basis 
of a species named P. quadraticaudatus. In regard to 
1One of the ‘ Pterygoti” described from Buffalo (P. globicaudatus) 
proves to be an Eurypterus, and a synonym of Hall’s E. pustulosus. 
